N-(1,3-Dimethylbutyl)-N′-phenyl-p-phenylenediaminequinone (6PPD-quinone), a rubber tire oxidation product found in road runoff, is highly and acutely toxic to selected salmonids including coho salmon, brook trout, and rainbow trout but not other fish species and invertebrates studied to date. Sensitive species displayed increased ventilation and gasping, suggesting a possible impact on respiration. Here, adherent cell lines RTL-W1 and RTgill-W1 were exposed to 5− 80 μg/L 6PPD-quinone, and cytotoxicity, oxygen consumption rate (OCR), and biotransformation of 6PPD-quinone were measured to assess the ability of 6PPD-quinone to uncouple mitochondrial respiration in vitro. RTL-W1 cells were not sensitive to 6PPD-quinone, and exposure did not result in significant impacts on cytotoxicity or OCR. In contrast, RTgill-W1 cells demonstrated decreased cell viability at 80 μg/L and a 2-fold increase in OCR at 20 μg/L. Effects appear to be partly driven by toxicokinetic differences where incubation of RTL-W1 cells with 6PPD-quinone led to almost quantitative conversion of 6PPD-quinone into a suspected hydroxy-metabolite, which was not observed in RTgill-W1 cells. Exposure studies with primary cultures of rainbow trout gill cells indicated that 6PPD-quinone increased OCR by uncoupling the mitochondrial electron transport chain. Together, these findings suggest that 6PPD-quinone toxicity might be driven by a tissue-specific disruption of mitochondrial respiration.

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Perfluoroethylcyclohexanesulfonate (PFECHS) is an emerging perfluoroalkyl substance (PFAS) that has been considered a potential replacement for perfluorooctanesulfonic acid (PFOS). However, there is little information characterizing the toxic potency of PFECHS to zebrafish embryos and its potential for effects in aquatic environments. This study assessed toxic potency of PFECHS in vivo during both acute (96-hour postfertilization) and chronic (21-day posthatch) exposures and tested concentrations of PFECHS from 500 ng/L to 2 mg/L. PFECHS was less likely to cause mortalities than PFOS for both the acute and chronic experiments based on previously published values for PFOS exposure, but exposure resulted in a similar incidence of deformities. Exposure to PFECHS also resulted in significantly increased abundance of transcripts of peroxisome proliferator activated receptor alpha (pparα), cytochrome p450 1a1 (cyp1a1), and apolipoprotein IV (apoaIV) at concentrations nearing those of environmental relevance. Overall, these results provide further insight into the safety of an emerging PFAS alternative in the aquatic environment and raise awareness that previously considered “safer” alternatives may show similar effects as legacy PFASs.

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Purpose The purpose of this paper is to present a case study tracking the development and engagement of a group of experts by experience (The Independent Futures (IF) Group) who provided a lived experience voice to the Bristol Golden Key (GK) partnership within the Fulfilling Lives programme. The case study reports the genesis and impact of the group, as well as the facilitators of impact and experiences of the group members and those they worked in partnership with. Design/methodology/approach The research adopted an iterative approach drawing on multiple data sources over an eight-year period. An inductive ethnographic analysis of stakeholder and partnership meetings was combined with documentary analysis and thematic analysis of interviews with experts by experience and service providers. Findings The voice of lived experience provided by the IF group contributed to the GK partnership through various channels. Evidence of this contribution and its impact was found at programme, city-wide and national levels of the service ecosystem. Furthermore, IF members recognised the value of the group in contributing to systems change and service improvement, but also for themselves. Practical implications This case study serves to illustrate the impact of the lived experience voice on services and systems change, specifically the provision of that voice from a formalised advisory group. The successes and challenges of the group and the experiences of its members are reported with a view to sharing learning that may influence future co-production initiatives with experts by experience and service provision for those experiencing multiple disadvantage. Originality/value The insights provided by the longitudinal observation of the group as it was formed and evolved, coupled with insights provided by the experts by experience, have important implications for facilitating and supporting sustainable lived experience input.